Arrangement for adapting the speed of take-up to the speed of feed in producing thread or tape material with originally low mechanical strength



Jan. 15, 1952 LJUNGBERG 2,582,639

ARRANGEMENT FOR ADAPTING THE SPEED OF TAKE- THE SPEED OF FEED INPRODUCING THREAD OR TAPE MA WITH ORIGIN ALLY LOW MECHANICAL STRENGTHFiled Sept. 22, 1949 /3 K W w Patented Jan. 15, 1952 Ann entrnnir 'i oaADAPT'ING THE! SPEED "OE-TAKEFUP 'T0'- T HE sFnEnjor )FEED' INPRODUCING'YTHRE'AD OR' TAPE MATERIA'L wrrnq ORIGINALLY? Low: MECHAICAL-1:

In producing some thread or tape material the mechanical strength whenleav ng" 'tlie' machine is still so low that a pulling, for instancerorrouing up on1drJ'un'1's-. or: cylinders;;.will;- affect the shape, Firstafter having been oooled to a lower temperature dried, or has" b ngiven.i g other manner'amncreaseu.zfiechan cai str gth, a; mciianial'fstrsssuouiu f a glowed. But. I g I nowgreatcareoii'ght"to'beta take-up is continuously increasing with thediameter of the roll which is being built up, while the rate of deliveryfrom the machine remains constant.

This invention relates to an arrangement for adapting the speed oftake-up to the speed of feed, especially useful for the production ofthread or tape material with low original mechanical strength. Theobject of this arrangement is that the thread or tape material isdeviated from its natural straight path on a point, where its strengthhas already been increased by means of revolving wheels or rolls overand/or between which the material is pulled, the axes of such wheels orrolls being so arranged as to enable a lateral motion of the wheels orrolls. An increase of mechanical tension in the thread or tape materialwill cause the lateral motion 01' the above mentioned wheels or rolls,and a brak ing device influenced by this motion affects the rate oftake-up so as to always adapt this rate to the rate of delivery of themachinery.

Arrangements according to the invention are illustrated in theaccompanying drawing, where- Figures 1 and 2 show two projections of anembodiment suitable for thread material with good flexibility.

Figures 3 and 4 show the same for another embodiment.

Figures 5 and 6 show embodiments suitable for tape material and for lessflexible thread material.

Referring to Figures 1 and 2 an extrusion machine e. g. the outlet of alead press is denoted I. From here comes the extruded material or thethread 2. Via the inlet 3 it is led into a groove in a brake-shoe 5having the shape of a bow and pivoted on a bearing at the point 4. Fromthe brake-shoe '5 the thread is laid around the wheel *6, laterallymovable with respect to the brake-shoe 5. If there is a pulling stressin the thread at the outlet 1 where the thread is taken up on a reel notshown in the drawing,

I the wheel 6 and the brake-shoe 5 will approach -'s v;e nskas, Elektriska Aktiebolageti swedish corporation p22, 1949, serial No. 117,214

September. 28, 134 8.

' e of the braking'power depends upon the "pulling power then 1 havingto 'overfliai e l ad I 2 f is extruded-Q too rapidly 7 from ower usetdth brake-shea 5 will a pear, whereas a pulling at the outlet 1 and asmall braking power at the inlet 3 will cause a great braking powerresulting from an approach of the wheel 6 to the brake-shoe 5.

At a certain magnitude of pulling power the friction of the brake-shoe 5increases so as to cause a braking power upon the wheel *6 resultingeven in a friction between the thread 2 and wheel 6 and the remainingpulling power in the thread 2 at the outlet of the extrusion machine isvery low with respect to the power at the outlet of the braking device.

By means of letting the thread '2 make several turns around the wheel 6the braking power can be increased to any desired value. This is shownin the Figures 3 and 4 having the same indices for the partscorresponding to those of the Figures 1 and 2. The braking effectbetween the brake-shoe 5 and the wheel 6 will in this case be maintainedby a separate brake drum '8 fastened to the centre of the wheel 6, thebrake drum being afiected by a brake-shoe ll in conjunction with the bow5. The wheel 6 can be substituted by one or several rolls for widertapes or by one or several wheels, in order that the tam will not haveto be bent at such large angles.

Such an arrangement is shown in Figure 5, where the tape 2 from theextrusion machine I is led over the roll In between the rolls I I, sothat the tape is deviated from its straight path. A pulling power at theoutlet l2 will press the rolls I0, I I against their braking devices l3,the effect of braking and friction between tape and rolls being producedas previously described.

By means of several wheels or rolls the effect can be increased to anydesired extent.

There are different means available to increase the coefficient offriction of the surfaces of the Wheels or rolls, and in some cases evena sharptoothed surface will be allowed.

An increase of the braking efiect of the braking drums can be obtainedby means of levers or some other arrangements if the desired frictionhas got to exceed the one normally obtained between the thread or tapematerial and the wheels or rolls.

ii d i @5 1 a a maximum 1 1 l pwer is; obtained when the wheel is frtionfoif,thet igadagain'stthe whole mae iiiefil no noteworthy braking 1I claim as my invention: 1. An auxiliary device for a machinemanufacturing a thread or tape by extruding a mate-" strength increasesrapidly therefrom, comprising an extrusion mouth-piece, a roll forreceiving the extruded material, a braking clutch for said roll, andmeans whereby tension in the extruded material causes the clutch toengage said roll, the said receiving roll and the extrusion mouth-piecebeing spaced from each other to the extent necessary to permit theintervening extruded material to attain sufficient mechanical strengthto withstand the pull when it reaches the roll. 1

' 2. An auxiliary device for a machine manufacturing a thread or tape byextruding a material having a low tensile strength when the materialleaves the extrusion means and which strength increases rapidlytherefrom, comprising an extrusion mouth-piece, a pivoted roll toreceive the extruded material, a brake-shoe for said roll, and meanswhereby said brake-shoe is engaged by said material and is actuatedthereby before such material engages said roll, the said receiving rolland the extrusion mouth-piece being spaced from each other to the extentnec- 4 essary to permit the intervening extruded material to attainsufllcient mechanical strength to Withstand thepull when it reaches theroll.

3. An auxiliary device for a machine manufacturing a thread or tape byextruding a material having a low tensile strength when it leaves theextrusion mouth-piece and in which the said strength increases rapidlytherefrom, comprising a pivoted roll receiving the extruded material, abrake-shoe movable in relation to said roll, and .means whereby theextruded material is conducted from the mouth-piece and is caused 7REFERENCES CITED Thefollowing references are of record in the file ofthis patent: Y

UNITED STATES PATENTS Number Name Date 1,388,342 Hopkins Aug. 23,19211,836,613 Oehmichen Dec. 15, 1931 Moncriefi et a1 May '31, 1933

